PHP implements a method to generate corresponding arrays based on strings, PHP strings correspond to arrays_PHP tutorial

php implements the method of generating corresponding arrays based on strings, php strings correspond to arrays

The example in this article describes how PHP generates corresponding arrays based on strings, which is a practical technique. Share it with everyone for your reference. The specific method is as follows:

Let’s take a look at the following example:

<&#63;php 
$config = array( 
 'project|page|index' => 'content', 
 'project|page|nav' => array( 
 array( 
 'image' => '1.jpg', 
 'name' => 'home' 
 ), 
 array( 
 'image' => '2.jpg', 
 'name' => 'about' 
 ) 
 ), 
 'project|page|open' => true 
); 
&#63;>

Generate the following array based on $config:

<&#63;php 
$result = array( 
 'project' => array( 
 'page' => array( 
 'index' => 'content', 
 'nav' => array( 
  array( 
  'image' => '1.jpg', 
  'name' => 'home' 
  ), 
  array( 
  'image' => '2.jpg', 
  'name' => 'about' 
  ) 
 ), 
 'open' => true 
 ) 
 ) 
); 
&#63;> 

Method: Use eval to implement:

<&#63;php 
$config = array( 
 'project|page|index' => 'content', 
 'project|page|nav' => array( 
 array( 
 'image' => '1.jpg', 
 'name' => 'home' 
 ), 
 array( 
 'image' => '2.jpg', 
 'name' => 'about' 
 ) 
 ), 
 'project|page|open' => true 
); 
 
$result = array(); 
foreach($config as $key=>$val){ 
 
 $tmp = ''; 
 $keys = explode('|', $key); 
 
 for($i=0,$len=count($keys); $i<$len; $i++){ 
 $tmp .= "['".$keys[$i]."']"; 
 } 
 
 if(is_array($val)){ 
 eval('$result'.$tmp.'='.var_export($val,true).';'); 
 }elseif(is_string($val)){ 
 eval('$result'.$tmp.'='.$val.';'); 
 }else{ 
 eval('$result'.$tmp.'=$val;'); 
 } 
 
} 
 
print_r($result); 
 
&#63;> 

Output result:

Array
(
[project] => Array
(
[ page ] => Array
(
[index] => content
[nav] => Array
(
[0] => Array
(
[image] => 1.jpg
[name] => home
)
[1] => Array
(
[image] => 2.jpg
[name] => about
)
)
[open] => 1
)
)
)

I hope this article will be helpful to everyone’s learning of PHP programming.

How to extract the value of an array containing a certain string in php from an array

$map = array('aa' => '3,4,5,6;',
'bb' => '3,4,6,7;',
'cc ' => '5,8,1,3;',
'dd' => '1,5,7,9;'
);
foreach ($map as $k = >$v) {
if (strpos($v, '3,4') !== false) {
echo "'$k' => '$v'df250b2156c434f3390392d09b1c9563 ";
}
}

Create array through string in php

First process the string into the form of PHP defined array, and then use eval to execute:

$str="
Array
(
[15] => Array
(
[id] => 2304
[fromtype] => item
)
[16] => Array
(
[id] = > 2313
[fromtype] => item
)
[17] => Array
(
[id] => 4265
[fromtype] => item
)
)";

$str=preg_replace('/\[([a-z]+)\]\s*=>\s*([0-9a-z ]+)/',"'\$1'=>'\$2',",$str);
$p=array('Array','[',']',' )');
$to=array('array',"'","'",'),');
$str=str_replace($p,$to,$str);
//echo $str;

eval("\$arr = ".$str.'; ');
print_r($arr[15]);

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